Internal-combustion engine.



0. LASCHE. i'NTERNAL CGMBUSTION ENGINE..

APPLICATIO FILED SULY 8.1914.

vPatente Dec. 5,1916.

Inventor. Oskar Laschewifness UNITED STATES PATENT OFFICE.

OSKAB LASCEE, 0F CHARLOTTENBURG, GERMANY, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A. CORPORATION 0F N EW YORK.

INTERNL-CGMBUSTION ENGINE.

Specification of Letters Patent.

To all 'whom t may concern:

Be it known that I, OsirAn Lasci-1n, a subject of the Emperor of Germany, residing at Charlottenburg, Germany, have invented certain new and useful Improvements in InternaLCombustion Engines, of which the following is a specification.

The present invention relates to internal combustion engines of the type having two oppositely mowing pistons which serve to cover and uncover the inlet or scavenging exhaust ports, and in which the cranks of the respective pistons are angularly displaced relative to each other by an amount somewhat less than 180 degrees so that the piston which controls the exhaust ports leads the other. As is known, the advantage of this arrangement is that the exhaust ports are opened prior to the opening of the inlet ports so as to permit a portion of the exhaust gases to escape and the pressure in the cylinder to decrease before the inlet ports arey uncovered, and are closed prior to the closing 'of the inlet ports so as to increase the charge.

An engine of this type is designed to operate in one direction only, it being obvious that if reversed the piston controlling the inlet ports would then lead that controlling the exhaust ports which would result in the inlet ports opening prior to the exhaust ports so that exhaust gases would escape through the inlet ports and mix with the incoming charge of air. This is due to the fact that the pressure in the cylinder'at this time would be greater than that of the scavenging air.

The object of the present invention is to provide an arrangement whereby an engine of' this type maybe reversed.'

Fori a consideration of what I believe to he novel and my invention, attention is directed to the following' specification and the claims appended thereto.

vReferring to the drawing, the figure is a longitudinal section of an internal combustion engineA illustrating one form which my invention may take.

' `In the drawing, 3 indicates the cylinder and 4.-, 5 the oppositely moving pistons which control the inlet or scavenging ports 6' and the exhaust ports 7.

8 indicates a receiver or conduit through which the scavenging air is led to the inlet ports. This air is supplied under pressure as is well understood. The exhaust gases are conveyed away by conduit 9. The pis- 4tons are connected to their respective cranks 10 and 11 by the connecting rods 12 and 13. The cranks 10 and ll are angularly displaced relative to each other, as shown, whereby in forward operation, which in the present instance vis clockwise, the piston 5 leads the piston -Ct for the reasons already referred to.`

Located in the inlet conduit 8 and controlling the passage of the supply of air therefrom to the admission ports 6 is a valve 14 yieldingly held on its seat by the spring 15. The stem 16 of the valve is connected to one end of the hand lever 17V fulcrumed at 18, and by means of which the valve may be moved from its seat and held open. The valve 14 is also arranged to be opened by the toggle levers 19 and 20 attached at one end to the valve stem and pivoted at the other end to the fixed support 21. This toggle is operated by the cam 22 mounted on a suitable shaft. mounted on the main shaft. It will be clear that when the hand lever '17 is shifted to open valve 14 the toggle will be moved out of operative relation to the cam, while when moved to close the valve th'e toggle will be engaged by the cam to open the valve upon each revolution.

At 23 and 24 are shown suitable'opening's through which fuel and Starting air may be introduced, the fuel injector and air starting valve being omitted since they form no part of the present invention.

During normal forward operation the hand lever '17 will be lmoved to the dotted line position and fastened in any suitable manner. This opens the valve 14 and moves the toggle out of operative relation to the operating cam 22. erate in the forward direction in the ordi- Patented Dec. 5, 1916.

As here shown the cam is The engine Awill then op- Sli . will. be so i',

nnly'iniinner'. Vir lien it is flesii'erl to reverse the engine, the levell .l' n'ioi'ed to the `l'lill line position flic valve will llien lie lielcl to its sont by ille spying lliy und the mkg-gli; will be moved into position te lie engaged by the cnn 522. 'll'ie 'if'iili'e when closed ents olif the supply nl tn the 'inlet neri-s iincl. lne sinn ned :in lo nnt nnen Ilie sinne iinl'il the eiilianst 'imi-ts; .l'ni'ie leen nnern'ei'eil by tlm piston ij. lily tl'iif; nonnatlie supply ol an' en mieli @elle cnt n ln'itii i ie exliiinsil. ports lnive been nncni n'ecl lil.` pei'iiiil; the i'n'esisin'e in tile I crease until ily is snlifiinitiiilly flow that 0jE lli@ :se ng; linx,

ln neem-clinic@ wil-'n the fnovisii'ins elf the patent tajiitcs, Ilim'e .li' eriiied the in'i'iiei* ple of operation. of' iny ii'entiniih iin 'itl'i ill'ie :ipmii'i'ilus which ion' ein' inl-r tn nl'. L" C bef-l1 eii'iliodiinignl; flier-eel; lin-;

in lnii'e it ien'ijlm tnnil tllnl. alii;- :1;: piii'nizrs ssline'n in onli.' i'e nini liz-.ib the invention cnn lie ein-rief! fini 5:5' nlliei.' l

ln; im angie other: lilinn lnl'l" .i'liei'elev lli()- ninton conti-.fil

poi

tin: :inst engine iti ined.

In mi intr-.inni c-oinl'ni'l'inn engine, lie coi'nliinn'tion o'i" ii. nifliinl i' iipponii'ely inoiinfz pistoni; tliez'cin. inlet iini'l exliinit ports wliivli. are en'veinil. iim'l i.nien'.'eireil lijf 'tl'io pistons', ei'iinlis 'loi' the pistons which me iingulai'ly rliniiliiierl i'elntie to @noli nl'l'iC-l l); :in :ingle i'itl'ni' ll'nin i90" \\lie.|'el f upon forward oinnzitim'i l'lie nitnn eentrollingl tlie exlizninl: pei'tsf leinl: il'ie niinii'i'i'i' .-"nyiti'ollingf, llie inlet noi-lis, i'nli'e ineiins efnziliri'lling l'ii supply el" nir to Lim inlet noi't und nii-:ins for holding' siii-il ifnli'i: cloned until iii'ilei' tl'ie exhaust [ioil'n begin to be. inioeverecl when the engine is reverse( 3. n :in intei'lnil ei'nnbnstion engii'ie; tlie Qomlinntion of :i cylinder, opnonitely moving pistons tlim'ein.J inlelziiml ex'lifinsit ports '-.Vliicl'i :ii'e eovvi'ml :nifl nneoii'n'ell liv tlie exhaust ports lenils l'lie pinten enntrnlln'in the inlet- *lieimsiplnfl n'ieiinfi l'oi' slnilhmg o'lle the su 'l'v ol im' to tlm inlet north' 'linf1nn' exlnnint iioiifi lm in to open when tlie engine silly.; ln eneli nlliei' Y for shutting of the supply of air to the in- In Witness whereof, have hereunto set let port until after the exhaust port begins my hand this 20th day of June, 19.14. to uncover, a lever through which said valve l OSKAR LASCHE. means is operated, a Cam, and means for Witnesses:

5 moving the lever into and out of operative ERICH UBEBLE,

relation t0 the cam. GUSTAN' HULBRQCK. 

